iPhone Charger

March 30, 2009 eBatteryChargers.com 10 comments

charger This is a simple DIY iPhone charger circuit that can be built with a few resistors.
First, you need to buy 4 resistors with this values: 2 of 50 kΩ, 1 of 100 kΩ and 1 of 150 kΩ.
Ok, you got 4 resistors, now you need a 5V power supply, you guessed it, another USB cable. An USB cable has +5V on pin 1 and -5V (or ground) on pin 4.

If you can handle a cutter, gently cut off the isolation and reveal the wires inside. See what colors the wires have that are connected at pin 1 and 4. Note or remember and then with an soldering gun solder the cables to the iPhone charger circuit like in the schematic.

iPhone charger circuit

iphone charger

If you don’t want to cut the iPhone cable, buy an USB extension cord.
Make sure the positive and negative terminals are connected correctly and use a voltmeter to make sure everything is correct.

usb pinout

usb pinout

We received informations that you can use it as an iPhone 3G charger but we cannot guarantee it.

Disclaimer: I will not be responsible if you destroy you iPhone with the charger information posted here.

iPhone chargers photo gallery

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Circuits iPhone

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Written by barak about 11 months ago. Reply

Hi,
in the first picture you connected pin4 to gnd while in the second picture pin4 in usb is marked as 5v,

what is the correct one?
- Written by eBatteryChargers.com about 11 months ago. Reply
  
  You are right, I have modified the picture.
Written by dejswa about 10 months ago. Reply

I would be surprise if this circuit would charge anything!

You are describing a pseudo 2 volt power supply with an output impedance of 150 kohms. Thus, this charger could supply around 1 microamp of power with about a 10% voltage drop on the ‘power supply’.

This about 2 microwatts of power!!
- Written by bob about 7 months ago. Reply
  
  except the resistance is not added in the power path. pin 2 and 3 are the data lines.
Written by Rico about 9 months ago. Reply

hi,

I just pulled my charger cable by mistake (the end that connects to the iPhone ver.2g) and need to reinsert them, but there 4 openings and the charger has 2 wires.

Any advice on how to?
Written by kk about 7 months ago. Reply

this makes your iphone 3gs unstable, and will crash until you pull the cable out. I just tried this and it is a bit flaky.
Written by Dacia Merring about 2 months ago. Reply

Im glad I found this web page, I couldnt locate any information on this subject matter before. I also run a niche site and in case you are ever interested in doing a bit of visitor writing for me if possible feel free to let me know, i’m always look for people to check out my website. Please stop by and leave a comment sometime!
Written by darko about 1 month ago. Reply

this didnt work for me. did everything as on picture but when i plug iphone cable into a female usb, iphone does not start to charge
Written by T. Tran about 23 hours ago. Reply

Can the 2x 50k resistor be replaced with 2x 100k? All they do is dividing the 5v into 2.5v to satisfy the requirement, I don’t think it needs to provide any current.
The reason for asking is that then all I have to do is to but plenty of 100k resistor since the circuit uses 3.
Alternatively the 150k can be reduced to 75k and thenthe bottom 100k be changed to a 50k? I am simply trying to simplify it further with either 3x100k or 3x 50k and either a 150k or a 75k resistor respectively.
Written by T. Tran about 10 hours ago. Reply

In fact I read that in the real Apple USB charger the resistors are 75k/49.9k and 43k/49.9k, interestingly pin 2 thus see 2.7v not just 2.5v.

In any case I have converted many USB charger using your resistor value and they worked very well. Many thanks.

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